This is caused when there is a class file that your code depends on and it is present at compile time but not found at runtime. Look for differences in your build time and runtime classpaths.

This is caused when there is a class file that your code depends on and it is present at compile time, but not found at runtime. Look for differences in your build time and runtime classpaths.
http://docs.oracle.com/javase/6/docs/api/java/lang/NoClassDefFoundError.html
> Thrown if the Java Virtual Machine or a ClassLoader instance tries to > load in the definition of a class (as part of a normal method call or > as part of creating a new instance using the new expression) and no > definition of the class could be found.